Typewriting machine



May 4 ,1926. 1,583,263

B. c. STICKNEY TYPEWRITING MACHINE Fi l ed July 14 1922 2 Sheets-Sheet 1 B. c. STICKNEY TYPEWRITING MACHINE Filed July 14. 1922 2 Shfieets-Sheet 2 May 4,1926. 1,583,263

, lg t Patented May 4,

UNITED STATES PATENT OFFICE.

Bunnmm c. s'rrcxnnr, or nmannnrn, NEW JERSEY, AssIGnon 'ro unnnnwoon 'rrrnwnrrnn comm, on NEW YORK, n. Y., A conrona'rron or DELAWARE.

TYPEWRITIN MAQHIN'E.

Application filed July 14, 1922. Serial No. 574,866. 1

The present invention relates to platens for typewriting machines, and to processesfor making the same.

An object of the invention is the production of a platen, which, in use, may be relatively noiseless, and assure ease of type-key operation, and which, nevertheless, will assure clearness of type-impressions.-

A further feature of the invention isthe introduction into the platen of a typewriting machine of a core or base of such charaoter that, when the same is jacketed or faced with any one of various materials, the printing will be of high quality. I

The body is formed by win-ding a thin web of Para rubber under high tension, and

i stretched to the desired thinness, around a large drum, until the desired thickness of rubber cushioning material is attained; the drum being preferably inthe nature of an anvil which opposes inertia to the-type blows,and consists of a heavily overweighted metal tube or cylinder. The rubber is covered with exterior wear-resisting ma-,

terial. The. rubber and exterior material together form a tympan or surfacing for the drum, to soften and equalize the typeblows. I

Other features and advantages will hereinafter appear.

In the accompanying drawings, 1 Figure 1 is a view in cross-section through a platen in the procew of formation; a web of rubber being wound under high tension to form ajacket on the drum.

Figure 2-is a view in cross-section of the Figure 1 platen completed; a tubular jacket or facing of relatively hard rubber, celluloid,

or other suitable material, being in place on r the tensiOned rubber jacket. j

Figure 3 is a view in cross-section of .a

form of the invention .in which a web of paper is wound .over the rubber base on the drum or tubular core, which latter in this instance is shown as overweighted.

Fi re 4 is a view in cross-section of the Figure 3 tube completed.

' jacket or core 12 will be of great elasticity type-impressions.- Such a jacket may be Figure 5 is a view in, cross-section of a form of the invention in which a web of gutta-percha is drawn into thin windings upon the rubber facing on the tubular core.

Figure 6 is a view in cross-section of the completely wound Figure 5 platen in a mold in which the gutta-percha is finally shaped and conditioned by heating.

In the embodiment of the invention shown in Figures 1 and 2, the core 10 of the platen is preferably a steel tube which may be about an inch in diameter and 1; of an inch in thickness.

On the tube 10, a rubber web 11 is wound, under high tension, in layers to form a jacket 12 (see Figure 2) of any desired thickness. Ordinarily a thickness of from to of an inchfor the jacket 12 will be suflicient and satisfactory. In forming the jacket, the rubber web is led, untensioned as indicated at 13, from any suitable source, to tensioning rolls 14, from between which it emerges under tension as indicated at 11. When wound to desired thickness, the outer end of the tensioned web is cemented, or; otherwise secured, to the'face of the jacket formed by the web. i Y

The jacket 12 having. been formed on the drum, an outer jacket or wearing facing therefor is provided,-consisting of a thin tubular shellj15 which may be'of the relatively hard rubber usually constituting the platen jacket ofa typewriting machine,- or which may be of celluloid or other material suitable as a back against which typewriting may be effected. The facing-tube 15 may be slipped on over the jacket 12, but should fitfthe same snugly.

In a platen made as above .described, the

because of the high tension under which it is wound, but without yielding to the tv eblows so much as untensioned soft ru r would do; and will thus conduce to clear-cut faced. as described, and. a platen thus obtained, against which the types will strike with a muflie'd or deadened sound, as comparedto the, platens commonly in use.

In Figures 3 and 4, the metal core 10 has the jacket 12 formed thereon of superposed windings of highly-tensioned rubber in the manner described in connection with Figures 1 and 2. The outer jacket or facing 16 in this instance is, however, formed of loo roll, passes between rolls 18 which tension' windings of extremely tough, thin paper 17.

The paper web, led from a suitable supplythe same, and thence passes to the jacket or base 12, around which it is tightly wound,

- layer upon layer,'until the platen attains the proper diameter. At intervals a little adhesive may be applied between the windings of paper to keep them tight; and finally the end of the paper is secured by adhesive to the same, be treated with an adhesive, such as glue or mucilage, or with shellac, or with a rubber or other cement, the more firmly to hold the same. Preferably the aper, eitherbefore or after formation of the acket 16, is stained black.

The highlytensioned rubber surfacing 12' in the platen of Figure 4 acts, as in the I platen of Figure 2, to enhance the sharpness of type-impression, and to deaden the noise of type-strokes. In the Figure 4 form of the platen, however, the wear-resisting and type-cushioning paper jacket or facing 16 is itself highly elastic. and has other advantages, which, when it is combined, as described, with the rubber surfacing, results-in a platen on which printing of the finest qualityIma be effected.

n 10 is shown vas reinforced by a more mas sive tubular metal core 19v to increase the inertia or resistance of the anvil around which the facing 12 and 16 is wrapped.- The overweighting of the central metal core is of importance in securing clearness of the type-impressions. Italso conduces to uiet ness of operation. If desired, the tu ular core'oranvil part 10 of the Figure 2 platen max similarly be overweighted.

, further advantage gained by the: overweighting, is that the type-operating keys can be operated with a very much lighter touch than is the usual practice, sincethe over-inertia of the weighted platen results in clear type-im ressions, even though the ty e-blows are lighter than heretofore cons1 ered practicable. Preferably it is mainly by reason of its inertia that the platen offers sufficient resistance to the type-blows.

In the Figures 5 and 6 modification of the invention, the tubular metal core 10 and highly-tensioned rubber jacket12 are again shown, but in this instance the outer jacket or facm is of gutta-percha'. The guttapercha acing, as finally formed on the base 12 is cut into a web .or into sheets 22, and

passed between rolls 23 and secured at its free end to the jacket 12. Gripped by the rolls 23, the web is then stretched, preferably to nearly its breaking limit; and so is drawn into an extremely thin sheet 21, which is wrapped tightly around the'ja'cket 12, layer upon layer, to the desired thickness of the,

igures 3 and4, the tubular metal core' facing; whereupon its outer end is anchored to the next lower winding in any suitable manner.

The completely wound platen is then placed in a mold having metal matrices 24 and 25. formed to the desired true shape and size of the finished platen; and, by a process, well known in the treatment of gutta-percha, is finally shaped and conditioned by heat ,under pressure in the mold.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claim":

1. A platen for a typewriting machine,

comprising a core or base of superposed,

highly-tensioned sheets or layers of soft rubher, and a facing of resilient material thereon.

2. A platen for a typewriting machine, comprising a core or base of superposed, highly-tensione'd sheets or layers of soft rubher, and a facing of superposed thin, tough, tensioned sheets or layers of other material thereon.

3. A platen for a typewriting machine, comprising a core or base of superposed, highly-tensioned sheets or layers. of soft rubber, anda facing of other material thereon.

4. A platen for a ,typewriting machine, comprising a core or base of superposed, high'ly-tensioned sheets or layers of soft rub- ..ber, and a facing thereon of superposed sheets or. layers of gutta-percha greatly core, and a jacket or facing of resilient ma-' terial'closely fitted over the rubber'base.

6.- A laten for a typewriting machine, comprising a tubular metal core, a core or base formed of superposed windings of highly-tensioned soft rubber on the metal core, a jacket or facingof resilient material closely fitted over the rubber base, and another metal core within the first-mentioned metal core to serve as an anvil whereby to increase the inertia or resistance of the firstmentioned core. p

7. A method of making'platens for typewriting machines, comprismg winding, in superposed layers over a soft base, a thin web of stretched or distended gutta-percha; and shaping and unifying the windings of gutta-percha in a mold, under the influence of heat, to provide a facing shell for the platen. Y

8. An overweighted typewriter-platen including an interior anvil in the form ofa heavy drum of metal of approximately the full diameter of the-platen, and mainly by reason of its inertia offering. the required resistance to the type-blows, and relativelyshallow surfacing means upon said drumior receiving the type-blows and softening and equalizing the pressure of the type, said surfacing means formed partly of relatively soft interior elastic cushioning material and partly of harder exterior wear-resisting cushioning material.

' 9. An overweighted typewriter-platen including an interior anvil in the form of a heavy drum of metal of approximately the full diameter of the platen, and mainly by reason of its inertia ofiering the required resistance to the type-blows, and relatively facing means formed partly of tensioned soft-rubber windin and partly of harder exterior wear-resisting cushioning material.

10. A cylindrical platen for a typewriting machine, including an anvil opposing substantial inertia to the-shocks of the typeblows,.said anvil in the form of an overweighted metal'core, a layer of tensioned 25 soft rubber upon said core, and windings of harder materlal over the rubber.

' BURNHAM C. STICKNEY. v 

